Tuesday’s races are projected to cost at least $3.67 billion, making it the most expensive midterm vote in history.

• Back at the White House.

President Obama, who spent the last few days making a final campaign push through Democratic strongholds, meets today with Janet Yellen, the Federal Reserve chairwoman, to discuss the outlook for the economy.

• Where is Jerusalem?

The Supreme Court hears arguments today in Zivotofsky v. Kerry, a case in which the parents of a U.S. citizen born in the holy city are seeking to show that he was born in Israel on his passport.

Under longstanding State Department policy, supported by successive presidents, Jerusalem is a city without a country until the peace process is completed. But Congress disagrees.

• How a space plane ignited.

The Virgin Galactic aircraft that broke apart over the Mojave Desert on Friday, killing the co-pilot, shifted too early into a high-drag configuration that was designed to slow it down, federal investigators said.

• Russians say Ukraine’s rebels have a mandate.

Moscow said today that the re-elected leaders of the breakaway regions in eastern Ukraine should be able to negotiate with the central government in Kiev.

Ukraine’s president called the weekend vote a “farce,” and a long-term solution to the crisis appears far away.

• Germany warns Britain.

British officials said today they will continue to pursue policies that are in their “national interest,” despite warnings from Germany about making changes to immigration rules.